0255R - AESS499-03 - Komatsu Americaequipmentcentral.com/north_america/data/new_equipment...Komatsu’s PC128US-2 occupies a road width of 3.46 m 11'4" or less. This allows the machine

PC128US-2NET HORSEPOWER

64 kW 86 HP

OPERATING WEIGHT13030 – 13400 kg

28,730 – 29,540 lb

BUCKET CAPACITY0.35 – 0.67 m3

0.46 – 0.88 yd3

HY

DR

AU

LIC

EX

CAVA

TO

RPC128US-2

2

Small road occupied widthKomatsu’s PC128US-2 occupies a road width of 3.46 m 11'4" or less. This allows the machine to work on either side of a 7 m 23' wide lane without having to close both sides of the road.

PC128US-2 Hydraulic Excavator

Working in congested or confined areas can be a challenge. Komatsu’sPC128US-2 hydraulic excavator has a short tail swing profile, designed for

work in confined areas. By reducing tail swing, the PC128US-2 can work in areas where conven-

tional profile excavators would pose a safety risk. Perfect for work on roadways, bridge work,

urban areas, or anywhere space is limited, the PC128US-2 provides you with the performance

and productivity you expect from Komatsu equipment.

Comfortable cab● The PC128US-2 employs a new convex shape, large size cab

that provides ample space from head to toe and side to rear.

● Komatsu’s low noise design cab uses viscous cab mountingfor reduced noise.

● Sliding convex door facilitates easy entrance in confined areas and reduces the danger of being damaged on roadwaysbecause the door does not protrude when open.

High mobilityLarge drawbar pull and steering force display its ability when operating on a slope.

WALK-AROUNDWALK-AROUND

Intermittent wiperis useful for light rain.

Oil cooler provides excellent thermal

conductivity, improving heatbalance without increasing the

fan rotating speed, whichcontributes to reducing

the noise level.

3

FLYWHEEL HORSEPOWER64 kW 86 HP @ 2200 rpm

OPERATING WEIGHT13030 – 13400 kg28,730 – 29,540 lb

BUCKET CAPACITY0.35 – 0.67 m3

0.46 – 0.88 yd3

PC128US-2HYDRAULIC EXCAVATOR

Safe operationThe PC128US-2’s round form reduces theoperator’s need to constantly check behind himfor movement, as he would with a conventionalprofile machine.

High stabilityThe PC128US-2 offers exceptional lifting capacity andhigh stability with a large counterweight that requiresno additional clearance.

Wide working ranges Maximum digging height of the PC128US-2 is larger thanthat of the PC120-6. Raising the boom on the PC128US-2 to a wider angle enhances overall working performance. Jobsites that require a long upper reach, such as demolition andslope cutting, also benefit from the increased digging anddumping ranges of the PC128US-2.

Pump/engineroom partition

prevents oil fromspraying on the engine

if a hydraulic hoseshould burst.

Rear windowopens to improve

cab ventilation.

Rearview mirrorprovides view undercounterweight forimproved safety.

4

PRODUCTIVITYFEATURES

PRODUCTIVITYFEATURES

PC120

180° swing width: 3.46 m 11'4"

Minimum implementswing radius1.98 m 6'6"

Tail swing radius1.48 m 4'10"

Tail swingradius

reduced by650 mm

2'2"

Implementswingradius

reduced by350 mm

1'2"

Protrusion from track (cab)

145 mm 5.7"

Protrusion from track (tail)

235 mm 9.3"

(Included handrail 175 mm 6.9")

Lane Width3.5 m 11'6"

3460

mm

11'4

"

Logging road width3–4 m 9'10"–13'1"

Short implement swing radius:

Boom raising angle of the PC128US-2

is larger than a conventional profile

excavator, while front implement

protrusion is lessened.

Safe Operation With Small Tail Swing Even in Confined Areas

Road and Bridge Work

Track Protrusion

Short tail swing radius:

Because the tail of the PC128US-2

is more compact than conventional

models, the PC128US-2 reduces the

operator’s need to check behind

him for movement.

Logging Road Work

PC128US-2 PC120-6Maximum digging height 9220 mm 30'3" 8610 mm 28'3"Maximum digging depth 5445 mm 17'10" 5520 mm 18'1"Maximum dumping height 6870 mm 22'6" 6170 mm 20'3"

PC128US-2PC120-6

PC128US-2

PC128US-2

9220 mm 30'3"

5445 mm 17'10"

Max. digging depth

Max. digging height

PC128US-2

8230 mm 27'0"

Max. digging reach

Engine

The PC128US-2 gets its exceptional

power and work capacity from the Komatsu

S4D102E engine. Output is 64 kW 86 HP,

giving you increased hydraulic power while

improving fuel efficiency. The engine meets

emissions regulations, including CARB, EPA,

and EC, and noise levels have been reduced

for greater operator comfort.

Wider Working Ranges

Raising the boom on the PC128US-2 to a wider

angle enhances overall working performance.

Job sites that require a long upper reach, such as demolition and slope cutting, also benefit

from the increased digging and dumping ranges of the PC128US-2.

Excellent Productivity

Large Digging Force

The PC128US-2 has the largest bucket digging force and

arm crowd force, facilitating digging hard rock-bed. Digging

force ISO rating.

High Stability

The PC128US-2 offers exceptional lifting capacity and

high stability with a large counterweight that requires no

additional clearance.

*At maximum reach, ground level height and overside.

*PC120-6 measured with power max.

PC128US-2 PC120-6*Bucket digging force 9500 kg 9520 kg

20,940 lb 20,990 lbArm crowd force 6300 kg 6500 kg

13,890 lb 14,330 lb

PC128US-2 PC120-6Lifting capacity* 1150 kg 1150 kg

2,500 lb 2,500 lbWeight of 3400 kg 2255 kgcounterweight 7,496 lb 4,960 lb


5

6

Large Operator’s CabLarge Size Cab

The PC128US-2 employs a new

convex shape, large size cab that

provides ample space from head

to toe and side to rear.

Multi-Position Controls

The multi-position, pressure propor-

tional control levers allow the operator

to work in comfort while maintaining

precise control.

A double-slide mechanism allows the

seat and controllers to move together

or independently, allowing the operator

to position the controllers for maximum

productivity and comfort.

Low Noise

Komatsu’s low noise design

uses a partition between the

cab and engine room, an

airtight valve room, and

viscous cab mounts to

reduce noise levels at

operator’s ear from

80 to 73 dB(A).

Cab Mount

The cab rests on

viscous damping

mounts to reduce vibration

and noise from the machine body.

Operator fatigue is reduced.

Sliding Convex Door

The sliding convex door

facilitates entrance in con-

fined areas and reduces the

danger of being damaged on

roadways because the door

does not protrude when open.

Washable Floor

The PC128US-2’s floor is easy to

keep clean. The gently inclined surface

has a flanged floormat and drainage

holes to facilitate runoff.

The PC128US-2 cab interior is spacious and provides a comfortable working environment…

130

mm

5.1

" wid

er

20°–40°

PC128US-2PC128US-1PC120-6

270 mm 10.6" longer

Cab volume 1.4 times(compared with PC128US-1)

WORKINGENVIRONMENT

WORKINGENVIRONMENT

Skylight


7

8

Paper filter Paper filter

Dust is also collected inside filter paper. Dust is collected on surface of filter paper.

Filter glass(1/4 of whole periphery)

Retaining materials

Paper filter ofdensity gradient type

Paper filter(Density gradient)

High-performanceglass filter

3/4

1/4

Current filter element

Paper filter

1. Swing machinery oil filler2. Swing machinery dipstick3. Water separator (option)4. Coolant reserve tank5. Fuel drain valve6. PTO oil filler7. Engine oil filter

8. Engine oil filler 9. Engine oil dipstick10. Fuel filter11. Windshield washer tank12. Batteries13. Air cleaner

CabTool box

1

12

2

3

4

5

789 1011

6

13

A BRadiator

Engine

Hydraulic tankFuel tank

Control valve

Valve room

Easy MaintenanceKomatsu designed the PC128US-2 to have easy service access. By

doing so, routine maintenance and servicing are less likely to be skipped,

which can mean a reduction in costly downtime later on. Here are some

of the many service features found on the PC128US-2.

Optimum Maintenance Layout

With the newly added left and right side service doors,

it is possible to access the major maintenance points from

ground level.

Furthermore, the fuel drain valve, engine oil filter, swing

machinery oil filler, and PTO oil filler are remote mounted,

facilitating easy maintenance.

New Hybrid Filter Element

The new hybrid element in the hydraulic circuit filter extends

the element replacement interval to 500 hours and the hydraulic

oil replacement interval to 5,000 hours.

● High-performance glass-type filter is employed for 25% of the total filter area.

● Pore gradient-type paper media is used.

● The filter area is larger and has a longer life than pore gradient-type paper mediabecause it collects dust three-dimensionally.

MAINTENANCEFEATURES

MAINTENANCEFEATURES

Large Tool Box

Large tool box provides plenty

of space. Grease pump storage

space is also provided.

A B

Excellent ReliabilityDustproof Radiator Net

The dustproof radiator net prevents dust from

entering into the radiator core and causing

engine overheating.

Wave Fin Radiator

A high cooling efficiency wave fin is used on the radiator.

Dual Filter Air Cleaner

A dual filter air cleaner is employed to

prevent dust from entering the engine.

Metal Guard Ring

The metal guard ring protects all the

hydraulic cylinders from seizure and

improves reliability.

Double Lock Connectors

The double lock connectors

prevent electrical connections

from loosening during

operation.

Dustproof net

RadiatorOil cooler

Wave Fin Radiator

Dustproof Radiator Net

Safety FeaturesPump/engine room partitionprevents oil from spraying on the engine if a hydraulic hoseshould burst.

Large handrail isinstalled for gettingon/off machine cabsafely.

Steps with no-skid sheet provideanti-skid footing for maintenance.

Boom holding valve reduceshydraulic drift of boom.

9


10

ENGINE

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu S4D102EType . . . . . . . . . . . . . . . . . . . . 4-cycle, water-cooled, direct injectionAspiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TurbochargedNumber of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 mm 4.05"Stroke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 mm 4.76"Piston displacement. . . . . . . . . . . . . . . . . . . . . . . . . . 3.92 ltr 239 in3

Flywheel horsepower . . . . . 64 kW 86 HP @ 2200 rpm (SAE J1349)Governor . . . . . . . . . . . . . . . . . . . . . . . . . . . . All-speed, mechanical

HYDRAULIC SYSTEM

Type . . . . . . . . . . . . . . . . . . . . . . HydrauMind (Hydraulic MechanicalIntelligence New Design) system.

Closed-center system with load-sensing valve and pressure-compensated valve.

Main pump:Type . . . . . . . . . . . . . . . . . . . . . . . . . Variable-capacity piston typePumps for. . . . . . . . Boom, arm, bucket, swing, and travel circuitsMaximum flow. . . . . . . . . . . . . . . . . 226 ltr/min 59.7 U.S. gal/min

Hydraulic motors:Travel . . . . . . . . . . . . . . . . . . . 2 x piston motor with parking brakeSwing . . . . . . . . . . . . . . 1 x piston motor with swing holding brake

Relief valve setting:Implement circuits . . . . . . . . . . . . . . . . . . . 325 kg/cm2 4,620 psiTravel circuits . . . . . . . . . . . . . . . . . . . . . . . 355 kg/cm2 5,050 psiSwing circuits . . . . . . . . . . . . . . . . . . . . . . . 280 kg/cm2 3,980 psiPilot circuit . . . . . . . . . . . . . . . . . . . . . . . . . . 30 kg/cm2 430 psi

Hydraulic cylinders:(Number of cylinders – bore x stroke)Boom. . . . . . . . . . . . . . . . . 2 – 105 mm x 1055 mm 4.1" x 41.5"Arm . . . . . . . . . . . . . . . . . . 1 – 115 mm x 1175 mm 4.5" x 46.3"Bucket . . . . . . . . . . . . . . . . . . 1 – 95 mm x 885 mm 3.7" x 34.8"

SWING SYSTEM

Driven by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic motorSwing reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Planetary gearSwing circle lubrication . . . . . . . . . . . . . . . . . . . . . . . Grease-bathedSwing lock . . . . . . . . . . . . . . . . . . . . . . . . . . Wet, multiple-disc brakeSwing speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.0 rpm

DRIVES AND BRAKES

Steering control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Two-leverDrive method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HydrostaticTravel motor . . . . . . . . . . . . . . . . . Axial piston motor, in-shoe designReduction system . . . . . . . . . . . . . . . . . . Planetary double reductionMaximum drawbar pull . . . . . . . . . . . . . . . . . . . . 11,100 kg 24,470 lbMaximum travel speed: High . . . . . . . . . . . . . . . . . 5.1 km/h 3.2 mph

Low . . . . . . . . . . . . . . . . . 2.4 km/h 1.5 mphService brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic lockParking brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil disc brake

UNDERCARRIAGE

Center frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-leg frameTrack frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Box-sectionSeal of track . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sealed trackTrack adjuster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HydraulicNumber of shoes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 each side Number of carrier rollers . . . . . . . . . . . . . . . . . . . . . . . . . 1 each sideNumber of track rollers . . . . . . . . . . . . . . . . . . . . . . . . . . 7 each side

COOLANT AND LUBRICANT

CAPACITY (REFILLING)

Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 ltr 52.8 U.S. galRadiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.2 ltr 4.8 U.S. galEngine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.0 ltr 4.5 U.S. galFinal drive, each side . . . . . . . . . . . . . . . . . . . . 2.5 ltr 0.7 U.S. galSwing drive . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 ltr 0.7 U.S. galHydraulic tank . . . . . . . . . . . . . . . . . . . . . . . . 69.0 ltr 18.2 U.S. gal

OPERATING WEIGHT (APPROXIMATE)

Operating weight including 4600 mm 15'1" one-piece boom, 2500 mm 8'2" arm, SAE heaped 0.44 m3 0.58 yd3 backhoe bucket,rated capacity of lubricants, coolant, full fuel tank, operator, and standard equipment.

SPECIFICATIONSSPECIFICATIONS

STANDARD EQUIPMENT

● Air cleaner, double element with auto dust evacuation● Air conditioner/heater● Alternator, 25 A● Batteries, 110 Ah/2 x 12 V● Boom holding valve● Cab which includes: antenna, AM/FM radio, floormat,

intermittent wiper and washer, large ceiling hatch, pull-up frontwindow, openable rear window, rearview mirror, removable lowerwindshield, sliding seat with 3" seat belt, tinted safety glass

● Cooling fan, mixed flow with fan guard● Corrosion resister

● Counterweight, 3400 kg 7,496 lb● Dustproof net for radiator and oil cooler● Instrument panel● Light, one front● Pump/engine room partition cover● Shoes, 600 mm 24", triple grouser● Starting motor, 4.5 kW● Travel alarm● Travel pedals● Turbocharger exhaust manifold cover● Vandalism protection provision tabs

Shoes Operating Weight Ground Pressure

500 mm 20" 13030 kg 28,730 lb 6.11 psi

600 mm 24" 13215 kg 29,134 lb 5.12 psi

700 mm 28" 13400 kg 29,541 lb 4.55 psi

11


WORKING RANGE AND BUCKET/ARM COMBINATION

DIMENSIONS

IJ

K

N

E

B

C

D

A

M

HG L

O

F

A

H

B

C DE

FG

2440 mm8'

Boom length 4600 mm 15'1" 4600 mm 15'1" 4600 mm 15'1"Arm length 2100 mm 6'11" 2500 mm 8'2" 3000 mm 9'10"

A Overall length 7225 mm 23'8" 7225 mm 23'8" 7120 mm 23'4"B Overall width 2500 mm 8'2" 2500 mm 8'2" 2500 mm 8'2"C Overall height (to top of cab) 2730 mm 8'11" 2730 mm 8'11" 2730 mm 8'11"D Ground clearance, counterweight 885 mm 2'10"E Minimum ground clearance 390 mm 1'3"F Tail swing radius 1480 mm 4'10"G Length of track on ground 2750 mm 9'0"H Track length 3480 mm 11'5"I Track gauge 1990 mm 6'6"J Width of crawler 2500 mm 8'2"K Shoe width 500 mm 20"L Grouser height 25 mm 1"M Machine cab height 1935 mm 6'4"N Upper structure width 2500 mm 8'2"O Distance, swing center to rear end 1725 mm 5'8"

Blade width 2470 mm 8'1"Blade height 590 mm 1'11"Implement offset from swing center 182 mm 7.2"Blade distance from swing center 2365 mm 7'9"

Boom 4600 mm 15'1" 4600 mm 15'1" 4600 mm 15'1"Arm 2100 mm 6'11" 2500 mm 8'2" 3000 mm 9'10"

A Maximum digging height 8905 mm 29'3" 9220 mm 30'3" 9655 mm 31'8"B Maximum dumping height 6555 mm 21'6" 6870 mm 22'6" 7305 mm 24'0"C Maximum digging depth 5040 mm 16'6" 5445 mm 17'10" 5945 mm 19'6"D Maximum vertical wall digging depth 4505 mm 14'9" 4900 mm 16'1" 5385 mm 17'8"E Maximum digging depth of cut for

2440 mm 8' level 4805 mm 15'9" 5235 mm 17'2" 5760 mm 18'10"F Maximum digging reach 7860 mm 25'9" 8230 mm 27'0" 8720 mm 28'7"G Maximum digging reach at ground 7730 mm 25'4" 8110 mm 26'7" 8600 mm 28'3"H Minimum swing radius 1745 mm 5'9" 1980 mm 6'6" 2250 mm 7'5"

Bucket digging force 9000 kg 19,840 lb 9500 kg 20,940 lb 9000 kg 19,840 lbArm crowd force 7300 kg 16,090 lb 6300 kg 13,890 lb 5700 kg 12,570 lb

BACKHOE BUCKET AND ARM COMBINATION

V – Used with weights up to 3,500 lb/yd3, W – Used with weights up to 3,000 lb/yd3

X – Used with weights up to 2,500 lb/yd3, Y – Used with weights up to 2,000 lb/yd3, Z – Not useable

Bucket Arms

Bucket NumberType Capacity OLW Weight of Teeth Tooth Size 6'11" 8'2" 9'10"

0.35 m3 0.46 yd3 610 mm 24" 421 kg 928 lb 4 X220 V V VKomatsu 0.50 m3 0.65 yd3 762 mm 30" 463 kg 1,021 lb 5 X220 V V W

“H” Series 0.60 m3 0.79 yd3 914 mm 36" 525 kg 1,157 lb 5 X220 W X YHD 0.70 m3 0.92 yd3 1067 mm 42" 564 kg 1,244 lb 6 X220 X Y Z

0.34 m3 0.44 yd3 610 mm 24" 441 kg 972 lb 4 X220 V V WKomatsu 0.45 m3 0.59 yd3 762 mm 30" 509 kg 1,122 lb 5 X220 V V W

“H” Series 0.56 m3 0.73 yd3 914 mm 36" 581 kg 1,280 lb 5 X220 W X YSD 0.67 m3 0.88 yd3 1067 mm 42" 652 kg 1,437 lb 6 X220 X X Z

LIFTING CAPACITY

PC128US-2 Shoe: 500 mm 20" Arm: 2.5 m 8'2" Unit: kg lbA 3.0 m 10' 4.6 m 15' 6.1 m 20' Maximum

B Cf Cs Cf Cs Cf Cs Cf Cs6.1 m *1750 *1750

20' *3,900 *3,9003.0 m *5000 *5000 *3650 2800 2450 1700 *1700 1200

10' *11,000 *11,000 *8,000 6,200 5,400 3,700 *3,700 2,6000.0 m *6800 4400 *3550 2400 2250 1500 1750 1150

0' *15,000 9,700 *7,800 5,300 5,000 3,300 3,900 2,500–3.0 m *6250 4350 3450 2350 2400 1650

–10' *13,800 9,600 7,600 5,200 5,300 3,600

B

A

C

Equipment:● Boom: 4.6 m 15'1"● Bucket: 0.44 m3 0.58 yd3

● Shoes: 500 mm 20"

A: Reach from swing circleB: Bucket hook heightC: Lifting capacityCf: Rating over frontCs: Rating over side

: Rating at maximum reach


B Cf Cs Cf Cs Cf Cs Cf Cs6.1 m *2500 *2500 *1850 1850 *1400 *1400

20' *5,500 *5,500 *4,100 4,100 *3,100 *3,1003.0 m *3800 *3800 *3400 2850 2450 1700 *1300 1050

10' *8,400 *8,400 *7,500 6,300 5,400 3,700 *2,900 2,3000.0 m 7100 4400 *3550 2350 2200 1450 *1500 1000

0' 15,700 9,700 *7,800 5,200 4,900 3,200 *3,300 2,200–3.0 m *6750 4200 3350 2150 2150 1400 2000 1350

–10' *14,900 9,300 7,400 4,700 4,700 3,100 4,400 2,900


B Cf Cs Cf Cs Cf Cs Cf Cs6.1 m *3300 3050 *2200 *2200

20' *7,300 6,800 *4,800 *4,8003.0 m *5800 5450 *3950 2750 2400 1700 *2000 1400

10' *12,800 12,000 *8,700 6,100 5,300 3,700 *4,400 3,0000.0 m *6750 4400 3400 2300 2250 1500 *1900 1300

0' *14,900 9,700 7,600 5,100 5,000 3,300 *4,200 2,800–3.0 m *6150 4400 3500 2350 2800 1900

–10' *13,600 9,700 7,700 5,200 6,200 4,200

* Load is limited by hydraulic capacity rather than tipping. Ratings are based on SAE Standard No. J1097. Rated loads do not exceed 87% of hydraulic lift capacity or 75% of tipping load.

OPTIONAL EQUIPMENT

● Arm—2100 mm 6'11"—2500 mm 8'2"—2500 mm 8'2" with piping—3000 mm 9'10"

● Blade assembly

● Hydraulic control unit—1 additional actuator

● Shoes, triple grouser—500 mm 20" —700 mm 28"

● Shoes, rubber shoe—500 mm 20"

● Track guiding guards● Track under cover

SOLD ONLY WITH BUCKET● Lug bushing● Play adjustment mechanism

Komatsu America International Company440 N. Fairway Dr., Vernon Hills, IL 60061

AESS499-05 ©2002 Komatsu Printed in USA DK06(5M)C DataKom 06/02(EV-3)

www.KomatsuAmerica.com Materials and specifications are subject to change without noticeis a trademark of Komatsu Ltd. Japan

Documents

0255R - AESS499-03 - Komatsu Americaequipmentcentral.com/north_america/data/new_equipment...Komatsu’s PC128US-2 occupies a road width of 3.46 m 11'4" or less. This allows the machine